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Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Loan interest receivable	$ 296		$ 261
Commitments to lend additional funds to TDR borrowers	$ 0		$ 0
Payment Deferral
Minimum period loan terms were extended	90 days	90 days
/
Minimum period loan terms were extended	90 days	90 days
Subsequent default during period		$ 0

X

- Definition

Days that a principal or interest payment is past due to be defined as a subsequent default

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Loan interest receivable

+ References

No definition available.

+ Details

Name:	cma_LoanInterestReceivable
Namespace Prefix:	cma_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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X

- Definition

Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

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- Details

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- Details

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